<template>
    <div class="sidebar">
        <el-menu class="sidebar-el-menu" :default-active="onRoutes" :collapse="collapse" background-color="#324157"
            text-color="#bfcbd9" active-text-color="#20a0ff" router>
            <template v-for="item in items">
                <template v-if="item.subs">
                    <el-submenu :index="item.index" :key="item.index">
                        <template slot="title">
                            <i :class="item.icon"></i>
                            <span slot="title">{{ item.title }}</span>
                        </template>
                        <template v-for="subItem in item.subs">
                            <el-submenu v-if="subItem.subs" :index="subItem.index" :key="subItem.index">
                                <template slot="title">{{ subItem.title }}</template>
                                <el-menu-item v-for="(threeItem, i) in subItem.subs" :key="i" :index="threeItem.index">
                                    <span style="padding-left:22px;">{{ threeItem.title }}</span>
                                </el-menu-item>
                            </el-submenu>
                            <el-menu-item v-else :index="subItem.index" :key="subItem.title">
                                <span style="padding-left:22px;">{{ subItem.title }}</span></el-menu-item>
                        </template>
                    </el-submenu>
                </template>
                <template v-else>
                    <el-menu-item :index="item.index" :key="item.index">
                        <i :class="item.icon"></i>
                        <span slot="title">{{ item.title }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
import bus from '../common/bus';
export default {
    data() {
        return {
            collapse: false,
            items: [
                {
                    icon: 'el-icon-lx-home',
                    index: 'dashboard',
                    title: '系统首页'
                },
                {
                    icon: 'el-icon-lx-people',
                    index: 'userAdmin',
                    title: '用户管理',
                    subs: [
                        {
                            index: 'userList',
                            title: '用户列表'
                        },
                        {
                            index: 'receivingAddress',
                            title: '收货地址'
                        },
                        {
                            index: 'shoppingCart',
                            title: '购物车'
                        },
                    ]
                },
                {
                    icon: 'el-icon-lx-file',
                    index: 'classification',
                    title: '商品分类'
                },
                {
                    icon: 'el-icon-present',
                    index: 'commodity',
                    title: '商品管理',
                    subs: [
                        {
                            index: 'commodityList',
                            title: '商品列表'
                        },
                        {
                            index: 'commodityAdd',
                            title: '发布商品'
                        },
                        {
                            index: 'commodityReviews',
                            title: '商品评价'
                        }
                    ]
                },
                {
                    icon: 'el-icon-lx-calendar',
                    index: 'order',
                    title: '系统订单'
                },
                {
                    icon: 'el-icon-lx-redpacket',
                    index: 'coupon',
                    title: '优惠券'
                },
                {
                    icon: 'el-icon-lx-settings',
                    index: 'system',
                    title: '系统设置',
                    subs: [
                        {
                            index: 'systemInfo',
                            title: '系统信息'
                        },
                        {
                            index: 'systemAdmin',
                            title: '管理员'
                        },
                    ]
                }
            ]
        };
    },
    computed: {
        onRoutes() {
            return this.$route.path.replace('/', '');
        }
    },
    created() {
        // 通过 Event Bus 进行组件间通信，来折叠侧边栏
        bus.$on('collapse', msg => {
            this.collapse = msg;
            bus.$emit('collapse-content', msg);
        });
    }
};
</script>

<style scoped>
.sidebar {
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
    overflow-y: scroll;
}

.sidebar::-webkit-scrollbar {
    width: 0;
}

.sidebar-el-menu:not(.el-menu--collapse) {
    width: 250px;
}

.sidebar>ul {
    height: 100%;
}
</style>
